is my fish sick

have this parrot fish for some time now noticed a spot on its dorsal fin sort of white in color does'nt appear to be on the out side of the fin. anything to worry about. thanks,chuck


Comments

water change

how often should water changes be done on a 55gal tank with 2 parrot fish and 4 more other good size fish.

Re: water change

It depends on several things. But, the bottom line is how much ammonia is being generated. I would say weekly 30% changes as well as gravel vacuum should be done. If you're able to keep your ammonia and nitrites at zero by doing the weekly changes, you'll be fine. Your nitrates should be kept at 20 or below.